50 hour FPS would be boring, Bioshock is proof that long FPS games turn uninteresting after a given time no matter how compelling it initially is.
You need RPG-like depth and massive variety to keep gamers fettered for 50 hours, a kind of variety that, frankly, does not exist within the genre.
And seeing how unvaried the original was, I doubt that Bioshock 2 will be a revolution in this regard, nor will Resistance 2 or Gears 2 or any other shooter any time soon.







